What causes this?

Perhaps it is a surface tension battle between degreaser & oil. If you brush the parts to clean them & thorougly mix the solution up, does the motion continue?

Perhaps it is a surface tension battle between degreaser & oil. If you brush the parts to clean them & thorougly mix the solution up, does the motion continue?

-------------------------------------------------------------------------------- All I have done is what you see: I stirred the solution up with and without the parts: The motion was the same. I agree about the surface tension. I was just puzzled that the whole thing went on ad infinitum.

Just a wild ass guess...

Is the solvent a good bit cooler than the ambient air? Could it be water condensation on the surface?

Erik

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Michael, this looks related:

It looks like surface tension of two liquids that don't mix. You can achieve the same results (well, similar) by pouring a tbsp of olive oil into a pot of water. Stir it up reeeeeally good. Let it sit. As the little puddles come together, they merge and make bigger puddles. That's what you have there, except that the densities of the liquids are closer than olive oil and water, and not as defined, so they appear as almost sheens, and not globules. But they are joining together to form larger puddles. The white part is the reflection of the light in the ceiling.

Steve ;-)

Heart surgery pending? Read up and prepare. Learn how to care for a friend.

I=A0think=A0it's=A0a=A0surface=A0tension=A0thing. Check=A0this=A0surface=A0tension=A0powered=A0model=A0boat.

Karl

"Michael Koblic" fired this volley in news: snipped-for-privacy@news5.newsguy.com:

Looks to me like that's an ultrasonic cleaner, and those are cavitation bubbles, moving due to harmonics in the tray or the shallow fluid.

LLoyd

Is this just degreaser and water with parts in a tub, or is there an ultrasonic unit there? I heard a loud hum in the background of the video.

I think you're right about the surface tension changing. It appears to be either grease or degreaser breaking down in the water. "Smart Scrubbing Bubbles" or "Enzyme Action" as the commercials go.

Either that or you have a brazillion bacteria in your water and they have no concept of surrender.

-- Most people assume the fights are going to be the left versus the right, but it always is the reasonable versus the jerks. -- Jimmy Wales

Is this just degreaser and water with parts in a tub, or is there an ultrasonic unit there? I heard a loud hum in the background of the video.

-------------------------------------------------------------------------------- Must get the strip light seen to...:-)

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I think you're right about the surface tension changing. It appears to be either grease or degreaser breaking down in the water. "Smart Scrubbing Bubbles" or "Enzyme Action" as the commercials go.

Either that or you have a brazillion bacteria in your water and they have no concept of surrender.

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I think Dennis got it spot on: Marangoni effect. The Youtube video is impressive. Funny, I remember the boats Llyod refers to from childhood.

-- Michael Koblic, Campbell River, BC

I can't get the images to play on my system. What format? a ".wmv" by any chance?

Anyway -- just guessing:

1) Is there vibration on the surface (some motor running in contact with it as part of another tool? 2) It could be evaporation causing cooling on the top surface, and heat from the bench to the tray causing convection? (Or is there a heat source as part of the cleaner? That would pretty much *force* convection.

Enjoy, DoN.

I can't get the images to play on my system. What format? a ".wmv" by any chance?

Anyway -- just guessing:

1) Is there vibration on the surface (some motor running in contact with it as part of another tool? 2) It could be evaporation causing cooling on the top surface, and heat from the bench to the tray causing convection? (Or is there a heat source as part of the cleaner? That would pretty much *force* convection.

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It's a *.MOV